Floating/grounded charged controlled memristor emulator using DVCCTA

Abstract

In this work, a charge-based memristor emulator is designed using a single active current mode component Differential Voltage Current Conveyor Transconductance Amplifier with one capacitor and two resistors as passive components. Importantly, the proposed circuit topology can be changed to either grounded or floating configuration using a single switch. Moreover, the proposed memristor design can be operated either in incremental or decremental configuration by using another switch. Therefore, using only two switches, the same circuitry can be utilized to design the floating/grounded incremental/decremental memristor. The pinched hysteresis loop area can be controlled by applying different biasing voltages. Further, the mathematical analysis is performed to drive the theoretical TiO₂ based results for the proposed memristor emulator. In addition, simulations confirming the theoretical analysis are conducted in PSPICE using the 180 nm TSMC technology with a supply voltage of ± 0.9 V by varying frequencies and capacitances to obtain a pinched hysteresis loop. The presented circuit performs effectively for frequencies upto 500 MHz while operating with grounded type memristor and 300 MHz with floating type design. To check the ability to remember the history of the proposed memristor, the non-volatility test is performed for both the incremental and decremental configurations. Moreover, the suggested memristor design is applied in an adaptive learning circuit to prove its feasibility in neuromorphic applications.